forked from OSchip/llvm-project
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_LOWER_BOUND_H
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#define _LIBCPP___ALGORITHM_LOWER_BOUND_H
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#include <__config>
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#include <__algorithm/comp.h>
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#include <__algorithm/half_positive.h>
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#include <iterator>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Compare, class _ForwardIterator, class _Tp>
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_LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
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__lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
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{
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typedef typename iterator_traits<_ForwardIterator>::difference_type difference_type;
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difference_type __len = _VSTD::distance(__first, __last);
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while (__len != 0)
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{
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difference_type __l2 = _VSTD::__half_positive(__len);
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_ForwardIterator __m = __first;
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_VSTD::advance(__m, __l2);
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if (__comp(*__m, __value_))
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{
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__first = ++__m;
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__len -= __l2 + 1;
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}
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else
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__len = __l2;
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}
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return __first;
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}
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template <class _ForwardIterator, class _Tp, class _Compare>
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_LIBCPP_NODISCARD_EXT inline
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_ForwardIterator
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lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
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{
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typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
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return _VSTD::__lower_bound<_Comp_ref>(__first, __last, __value_, __comp);
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}
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template <class _ForwardIterator, class _Tp>
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_LIBCPP_NODISCARD_EXT inline
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_ForwardIterator
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lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_)
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{
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return _VSTD::lower_bound(__first, __last, __value_,
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__less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>());
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}
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_LOWER_BOUND_H
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